Starcraft 2 Editor - Pathing Cliff Fill And No Fly Zones can't be deleted?!

So I was fiddling around with a map in the Starcraft Galaxy Editor thingy. accidentally placed a Pathing Cliff Fill and some random No Fly Zones down, but I can’t get rid of them.
I highlight them and press delete or go into their menu and right click them and press Clear, but nothing happens
I can’t go into their properties either!

Help! Everything in my map is broken ;U